Blow dryer attachment



FIG. 1 is a perspective view of a blow dryer attachment showing my new design, as seen from the left front quarter;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for blow dryer attachment, substantially as shown. 